Punch retainer mechanism



May 23, 1933 PUNCH RETAINER MECHANISM Filed Feb. 11, 1929 2 Sheets-Sheet1 5 22 2 25 I, A 22 .3 3/ Z8 7 y Ki}. 5/ I m I g A L 7; @2.

NNNNNN OR 1'! JCT/(2'7; BY ALJZQ mm MM ATTORNEY May 23, 1933. Km1,910,296

PUNCH RETAINER MECHANISM Filed Feb. 11, 1929 2 Sheets-Sheet 2 "[29czar/Z7? I 5 BY ll a L ATTORNEYS Patented May 23, 1933 UNITED STATESPATENT- orrlcs FLOYD C. KING, F BIBKINGHAI, IIIGE IGANQABSIGNOB '10GUARDIAN TRUST COM- PANY, OF DETROIT, MICHIGAN, A CORPORATION 01'MICHIGAN, TRUSTEE PUNCH RETAINER MECHANISM Application'fllefl February11, 1928. Serial 80.339445.

This invention relates generally to tool holders, especially punch anddie retainers, and consists of certain novel features of construction,combinations and arrangements of parts that will be hereinafter morefully described and particularly pointed out in the appended claims.

In the accompanying drawings,-

Fig. 1 is a vertical sectional view thru a punch and die and retainerstherefor illustrating the means for securing a punch or die in therespective retainer; Fig. 2 is a detail view of one of the retainingcams;

Fig. 3 is a detail view of one of the shells; Fig. 4 is an enlargedfragmentary sectional view of the punch;

Fig. 5 is a sectional view taken on the line 5-5 of Fig. 4; h

Fig. 6 is a side fragmentary elevation of the construction shown inFigure 4;

Fig. 7 is a fragmentary vertical sectional view thru a modifiedconstruction;

Fig. 8 is a bottom plan view of the lowermost body illustrated in Fig.7. Fig. 9 is a diagrammatic view. Referring now to the drawings,-1 is apunch having suitable shank and work engaging head portions, 2 and 3respectively, 30 4 is a body constituting a holder for punches and thelike having a bore 5'for receiving the shank 2 of the punch and having apocket or recess 6 at one side of the bore containing means forretaining the shank 2 in the bore 5, 7 is a die having a substantiallyfiat upper face 8 constituting a seat for the work 9 and having alongitudinally extending bore 10 for receiving the work engaging head 3of the punch, and 11 is a body constituting a holder for dies and thelike having a bore 12 for receiving the die 7 and having a recess 13 atone side of the bore similar to the recess 6 in the. holder 4 andcontaining means similar to the means in the pocket 6 for retaining thedie 7 in the bore 12. As shown the means in the recess 6 in the holder 4for retaining the punch shank 2 in the bore 5 comprises a lever 14having a rounded or spherical end portion 15 pivotally engag- .ing aroundedportion 16 of the recess'6 and base 18 of an arcuate recess 19 inone side of the punch shank 2, a coil spring 20 engaging the lever 14and normally holdin the arcuate end portion 17 thereof in the ore 5, anda shell 21 that constitutes a housing for the spring 20 and for thespherical end portion 15 of the lever and that prevents accidentaldisplacement of the said spherical portion 15 from the rounded portion16 of the recess 6. Preferably, the metal upon opposite sides of thearcuate recess 19 is cut away as illustrated at 19' in Figures 5 and 6to facilitate the removal of the lever 14 from the recess. Thus, bycutting away portionsas at 19' upon opposite sides of the re- 7 cessburrs are not apt to be formed in the metal as a result of the constantor=repeated action of the punch and holder while in use, sincesuflicient clearance is provided by the cut-away portions 19' to comnsate for this.

The rounded portion 16 o the recess 6 is concentric with the center 22of the spherical portion 15 and constitutes a hacker or hear ing forsaid spherical portion in all positions of pivotal adjustment of thelever. In fact, the arrangement of the spherical and rounded portions 15and 16 respectively is such that the s herical portion 15 slidablyengages the roun ed portion 16, and the outer free end of the lever isso fashioned with respect to the base 18 of the recess 19 in the punchthat the longitudinal thrust imparted to the lever when the free endthereof is engaged with the base 18 of said recess is transmitteddirectly from the spherical rtion 15 to the rounded portion 16. Thereore, as thelever swings in an arc the spherical portion 15 will transmitthis thrust or load correspondingly different points of the roundedportion 16. Moreover, due to this arrangement of the spherical androunded portions, the outer free end of the lever may be so fashionedthat the punch will be effectively held by the lever acting as a prop orbrace and may be easily and quickly released from the lever and removedfrom the body 4 as will be hereinafter more fully set forth. 7 VPreferably the arcuate end portion 17 is Figure 1 representing an arcconcentric with the center 22. Hence, when the arcuate end portion 17engages the base 1.8 of the recess in the tool shank 2, a propping orbracing action in contradistinction to a wedging action, and an areacontact instead of a point contact is obtained.

In use, the arcuate end portion 17 will normally be held by the spring20 in the bore 5 but when the shank 2 of the punch is inserted in thebore 5, the arcuate end portion 17 of the lever will automaticallyengage the base 18 of the recess 19 in the shank 2 and will effectivelyhold the punch in assembled position. However, any suitable means suchas the shank 50 of a tool 51 may be inserted thru a bore 25 into therecess 6 to disengage the lever 14 from the shank 2. Likewise a lever 30in the holder 11 may be utilized to hold the die 7 in the bore 12 in theholder and may be disengaged from the die by the insertion of the toolshank 50 thru a bore 31 in the holder 11.

Thus, with in construction a tool may be readily removed from a holderwithout the necessit of taking apart the holder or separating it fromthe usual backing plate 40. Moreover, a better gripping action isobtained and there is no tendency of the parts to wedge.

It will also be noted that with my construction the relationship of theretaining means to the punch or tool is such that the punch or tool isalways held in proper registration and position with respect to thecooperating die so that when thepunch head is lowered into operativeengagement with the work the said head will always register properlywith the punch head receiving aperture or bore 10 in the co-operatingdies. This is true irrespective of the construction or formation of thepunch head or tool.

In Figures 7 and 8 are shown a slight modification in which two holderbodies 30 and 31 are secured by bolts 32 in superposed relation and areprovided with bores for receiving a plurality of punches 1. As shown theholder body-30. is provided with a series of bores 33, arranged in thearc of a circle about a central bore 34, the central bore 34 being inalignment with a similar bore 35 in the holder body 31. lVith thisconstruction the retaining means for the respective punches in the body30 can be located in recesses 36 at one side of the. respective bores 33in said body. and the retaining means for the punch in the bore 34 maybe received in a similar recess 37 at one side of the bore 35 in thebody 31, the shank 38 of the center punch having an extension 38 forthis purpose and having the arcuate recess 39 thereof in said Iextension to be engaged by the cam 40 of the retaining means in therecess 37. Thus, with this construction a series of punches may bearranged relatively close for forming a series of holes in the work.

While it is believed that from the foregoing description the nature andadvantages of the invention will be readily apparent, I desire to haveit understood that I do not limit myself to what is herein shown anddescribed and that such changes may be resorted to when desired as fallwithin the scope of what is claimed.

What I claim as my invention is:

1. In combination, a tool, a holder therefor having a body provided witha'bore for receiving the tool and having a recess at one side of saidbore, means for limiting the insertion of the tool in said bore, andmeans operable automatically upon insertion of the tool in one directioninto the bore to engage and hold said tool against said limiting means,including an elongated member having a spherical end portion journalledin the recessand having an arcuate portion at 3 for having a bodyprovided with a bore for receiving the shank of a punch and having apocket at one side of said bore provided with a rounded face, means forlimiting the insertion of the shank in said bore and means operableautomatically upon insertion of the shank of the punch in one directioninto the bore to engage and hold said shank against said limiting meansincluding an elongated member having a rounded end engaging the roundedface and having an arcuate end portion engageable with a correspondinglycurved surface of the shank.

3. In a tool holder, a body having a bore for receiving the shank of apunch, and an elongated member extending through a wall of the bore atsubstantially an acute angle thereto, one end of the. member beingspherical and having a rocking engagement with the body. and the otherend of said member being substantially arcuate shape with the areeccentric to the spherical portion aforesaid and adapted to engage andhold a shank in the bore.

4. In a tool holder, a body having a bore for receiving the shank of apunch and having a recess at one side of the bore, and an elongatedmember adjustable in the body, having a rounded end portion in therecess and having a rounded end portion in the bore, a portion of therecess being eccentric with and serving as a bearing for the first namedrounded end portion aforesaid in positions of adjustment of said lever.

5. In combination, a tool, a holder therefor having a body rovided witha bore for receiving the too means for limiting the insertion of thetool in said bore and means operable automatically upon the insertion ofthe tool in one direction into the bore to engage and hold said toolagainst said limiting means including an elongated member having aspherical end portion bearing against a portion of the body and having arounded end portion for engagement with the tool.

6. In a tool holder, a body having a bore for receiving a tool andhaving a recess at one side of said bore provided with a rounded portionat the rear thereof, and means for holding the tool in said boreincluding an elongated member having a spherical portion bearing againstthe rounded portion of said recess and having a rounded end portioneccentric with the center of the said spherical portion and adapted toengage a tool in the ore.

7. In combination, a tool, a holder therefor having a body provided witha bore for receiving the tool having a recess at one side of the bore,means for limiting the insertion of the tool in said bore, and meansoperable automatically upon the insertion of the shank of the tool inone direction into the bore to engage and hold said tool against saidlimiting means including an elongated member having a spherical endportion bearing against a wall of said recess and having a rounded endportion in the bore for engagement with a tool, yieldable means normallyholding the rounded end portion in said bore, and a housing for theyieldable means enclosing a portion of the member and preventingaccidental displacement of the spherical portion from the wall aforesaidof said recess.

8. In combination, a tool holder having a body provided with means forreceiving a punch, and means associated with said body for holding saidpunch in said receiving means, including an elongated member having a.spherical end portion journaled in the body and having a rounded endportion eccentric to the spherical portion, and a punch having a shankin said body provided with a segmental recess receiving the rounded endportion of said member, the base of said recess being concentric withthe rounded end portion aforesaid but eccentric to the spherical portionof said member.

9. In a tool holder, a body having a bore for receiving the shank of apunch and having a pocket at one side of the bore provided with arounded face, and an elongated member having a rounded end engaging therounded face and having an arcuate end portion engageable with acorrespondingly curved surface of said shank, the rounded face aforesaidbeing eccentric with respect to the arcuate end portion of the elongatedmember whereby the latter may be readily dislodged from said shank.

10. In combination, a tool, a holder therefor having a body providedwith a bore for receiving the shank of the tool and having a recess atone side of said bore, and means for holding the shank in said bore.including an elongated member having a spherical end portion journalledin the recess and having an arcuate portion at its free end engageablewith an arcuate recess in the shank, said arcuate end portion and recesshaving their respective centers of curvature close to the center of saidspherical end thereby providing for ready engagement and disengagementof said member with said recess without longitudinal movementof thetool.

11. In combination, a tool, a holder therefor having a body providedwith a bore for receiving the shank of a punch, means for limiting theinsertion of the shank in said bore, said shank being insertible in andremovable from said body through one end of the bore, said body having apocket at one side of the bore provided with a rounded face, and anelongated member having a rounded end engaging the rounded face andhaving an arcuate end portion engageable with a correspondingly curvedsurface of a shank.

' 12. In a tool holder, a retainer 4 having a bore 5 therein forreceiving the shank 2 of a tool, said bore being closed at one end andproviding means 40 for applying axial pressure to said tool, said toolbeing insertible in and removable from said retainer through the openend of said bore, a pocket 6 in said retainer in communication with saidbore 5 and having a rounded seat 16, an elongated locking member 30having a rounded end 15 engageable with said seat and an oppositearcuate end 17 engageable with a correspondingly curved surface 18 ofsaid shank, spring means 20 within said pocket engaging sai member andnormally holding the end 17 of said member in said bore, the radius ofourvature of said end 17 being greater than that of the other end 15whereby axial pressure or stress applied to said tool will cause saidmember to grip and hold said tool securely in said retainer.

13. A tool holder as defined in claim 12 wherein the arcuate end 17 iseccentric to the rounded end 15 so that the member 30 may freely bereleased from engagement with the shank of the tool manually by means ofa releasing tool insertible through an opening 25 communicating withsaid pocket.

14. In a tool holder, a body having a tool receiving bore closed at oneend and open at the other, and means at one side of the bore operableautomatically upon insertion of a tool into the bore to engage and holdsaid tool against movement, including an elongated member having one endthereof mounted for pivotal movement in the body and having its ablemeans urging said elongated member other end free and operable to hold atool into said tool aperture into holding engage against the closed endof the bore. ment with a tool therein.

15. In a tool holder, a body having a bore In testimony whereof I aflixmy signature.

5 therein closed at one end and opening through FLOYD C. KING. I

a face of the body for the reception of a tool, means operableautomatically upon insertion of a tool into the bore to engage and holdsaid tool against movement, including an elongated member operable tohold the tool against said closed end, said member having one endthereof mounted for pivotal movement in the body at one side of the boreand having its other end free and movable into 15 the bore forengagement with a tool therein, I I

and yieldable means within the body urging the free end of said memberinto the bore for engagement with a tool therein.

16. In combination, a tool, a holder for the 20 tool having a bodyprovided with a bore for receiving the tool and having a recess at oneside of said bore, means for limiting the insertion ofthe tool in saidbore, means for holding said tool against movement in the bore includingan elongated member having. a spherical end portion journaled in therecess and having its other end free and urging the tool against saidlimiting means, and yieldable means within the body constantly engagingsaid elongated member and urging the free end aforesaid of the latterinto holding en agement with the tool within the bore. 17 n a toolholder, a body having a tool receiving bore and provided at one side of35 the bore with a recess having a curved portion, means for limitinginsertion of a tool in said bore, and means operable automatically uponinsertion of a tool into the bore to engage and hold said tool againstmovement in the bore, including an elongated propping member urging thetool against said limiting means, said member having a rounded lower endslidably engaging the curved portion aforesaid of the recess in the bodyand having its other end free and movable into the bore for engagementwith a tool j therein, the free end of said member having a portion forengagement with the base of a recess or groove in a tool in the bore.

18. In a tool retainer, a retainer member having a tool aperture closedat its upper end and open at its lower end, said retainer member beingprovided at one side of the aperture with a recess that opens into thesame and is provided with a spherical seat, and means operableautomatically upon insertion of a tool upwardly into the aperture toengage and hold the tool against movement in the aperture including anelongated member operable as a prop for holding the tool against saidclosed upper end, said member having a spherical end engaging saidspherical seat, the free end of said elongated member being movable intothetool aperture into and out of engagement with a tool therein, andyield-

